This book is indeed concise, as it manages to cover all the ideas of elementary number theory in a mere 91 pages. The proofs are also concise, leaving out many details, and this is likely to distress students. There are exercises at the end of each chapter; these are mostly straightforward applications of the ideas in the chapter.

The coverage is not well-balanced, with nearly two-thirds of the book being devoted to diophantine equations and diophantine approximation. A recent concise but less austere book with broader coverage is Underwood Dudley’s 2009 A Guide to Elementary Number Theory.